<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="container.css">

</head>
<body>
<div class="container">
    <div>
        <label>地区：</label>
        <select id="sltCity"></select>
        <select id="sltNation"></select>
        <select id="sltSchool"></select>

    </div>
</div>
</body>

<script src="city.js"></script>
<script src="nation.js"></script>

</html>